TCAC SYSTEM
Checking TCAC System
1) Check vacuum hose for connection, deterio-
ration or damage. Replace as necessary.
4 3
3) Check that when engine is started (and run at
idle speed) under the condition that air
cleaner is cool, valve on warm air side becomes
fully open and one on fresh air inhaling side
is completely closed.
4) If nothing was found faulty in the above step,
connect warm air hose.
1. Air control actuator
2. Therm0 sensor
3. Check valve
4. Orange side
Fig,
5-3-3
TCA C sys tern
2) With engine at a stop, make sure that the
valve indicated in figure is completely closed
(closing warm air side). This check should be
carried out by putting finger into duct after
removing warm air hose from it.
Fig. 5-3-4
Checking TCA C sys tern
If found defective in above step 2) or 3),
inspect following parts according to each
procedure.
[Air control actuator]
1) Disconnect vacuum hose from therm0 sensor.
2) Make sure that damper opens fully when
more than 20
cmHg
(7.87
in.Hg)
vacuum is
applied to ACA.
Also, make sure that damper is held at the
same position when a constant vacuum is
applied to it.
If damper doesn’t open or close smoothly, or
it isn’t held at the same position, replace ACA.
Fig. 5-3-5 Checking A CA
3
4
1. Air cleaner
2. ACA
3. Damper valve
4. Warm air
5. Fresh air
[Thermo sensor]
1) Remove air cleaner case cap.
2) Disconnect two vacuum hoses from therm0
sensor.
I)
Measure the temperature around therm0
sensor.
.)
Close a nozzle with finger and then blow air
into nozzle. If measured temperature is above
40°C (104” F), air should come out of therm0
sensor valve (valve is open) as shown in Fig.
5-3-6.
If the temperature is below 25°C
(77”F),
air
should not come out (valve is closed).
Replace defective parts.
5-19
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